中文摘要：

在 Beijing-Tianjin-Hebei (BTH ) 区域(中国) 的雾进化上的城市的紧张的影响数字地被调查与天气研究并且预报(WRF ) 模型结合了城市的华盖 parameterization 大楼精力模型(UCPBEM ) 城市的物理计划。实验与不同城市的紧张的影响的一个焦点被设计，它被自然土地，大楼，和精力消费的一篇不同部分报道在城市的环境在大楼内代表。当自然土地被归结为小部分时，这研究的结果显示城市的区域显著地影响雾进化(例如，不到 10%) 。发达土地通过城市的效果改变雾进化。当禁止早上时，更高城市的紧张(HUI ) 通常在整个日子导致更温暖的温度和更低的风速度特定的湿度损失和下午特定的湿度获得因为表面热流动，表面粗糙，和表面潮湿流动上的 HUI 效果。HUI 导致以后、更弱的液体水内容形成，与一个更高的液体水内容底，首先由于它近的表面温度上的效果。这发现暗示 HUI 可以为雾形成禁止条件。另外，有相等的自然、开发的陆地范围的城市的区域似乎极大地提高向上的表面潮湿流动，它从自然土地在发达土地和宽大的潮湿供应上被归因于相对大的潜在的蒸发的联合。作为结果，特定的湿度在下午增加。

英文摘要：

The influence of urban intensity on fog evolution in the Beijing-Tianjin-Hebei （BTH） region （China） is investigated numerically with the the Weather Research and Forecasting （WRF） model coupled with the urban canopy parameterization-building energy model （UCP- BEM） urban physics scheme. The experiments were designed with a focus on the influence of different urban intensities, which are represented by a different fractional coverage of natural land, buildings, and energy consumption inside buildings in an urban environment. The results of this study indicate that urban areas notably influence fog evolution when natural land is reduced to a small fraction （e.g., less than 10%）. Developed land changes fog evolution through urban effects. Higher urban intensity （HUI） generally results in warmer temperatures and lower wind speeds throughout the day, while inhibiting morning specific humidity loss and afternoon specific humidity gain because of the HUI effect on surface heat flux, surface roughness, and surface moisture flux. HUI leads to later and weaker liquid water content formation, with a higher liquid water content base, primarily due to its effect on near surface temperatures. This finding implies that HUI may inhibit the conditions for fog formation. In addition, urban areas with equal natural and developed land coverage seem to greatly enhance the upward surface moisture flux, which is attributed to the combination of a relatively large potential evaporation on developed land and an ample moisture supply from natural land. As a result, the specific humidity increases in the afternoon.